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Section 5 Movement of Data Carriers and Command Status
RFID System
Operation Manual
Section 5
Communications
Movement of Data Carriers and Command Status
Communications Control Protocol
The host device communications control protocol conforms to the OMRON SYSWAY protocol.
(1) Initially the host device has the right to send. When the host device sends a command, the right to
send is transferred to the ID Controller.
(2) When the ID Controller returns a response, the right to send is transferred back to the host device.
(3) The right to send is transferred on a carriage return.
(4) The SYSWAY protocol supports both 1:1 and 1:N communications.
(5) The 1:N communications are used when more than one ID Controller is connected to a single host
device. Up to 32 ID Controllers can be connected. Each command and response begins with a
controller number to identify the ID Controller. A horizontal parity check is performed as a frame check
sequence (FCS) to ensure robust error detection.
(6) The 1:1 communications are used when one ID Controller is connected to one host device. To simplify
procedures, a horizontal parity check is not performed.
(7) Even when using a 1:1 connection, 1:N communications can be set (i.e., N = 1). If 1:N communications
are set, always implement a horizontal parity check even if the connection is only 1:1.
■ Description
1. The host device send commands to the ID
Controller.
2. The ID Controller analyzes the commands from
the host device, executes communications with
the Data Carriers, and writes/reads data to/
from the Data Carriers.
3. When a read command is executed, the ID
Controller sends the data it has read in a
response to the host device. When a write
command is executed, the Controller send a
response indicating the end of processing to
the host device.
Host device
Communications
ID Controller
Read/Write Head Data Carrier
Command
Response
Communication
between Read/Write
Head and Data Carrier
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